3:160
إِن يَنصُرْكُمُ ٱللَّهُ فَلَا غَالِبَ لَكُمْ ۖ وَإِن يَخْذُلْكُمْ فَمَن ذَا ٱلَّذِى يَنصُرُكُم مِّنۢ بَعْدِهِۦ ۗ وَعَلَى ٱللَّهِ فَلْيَتَوَكَّلِ ٱلْمُؤْمِنُونَ
If Allah should aid you, no one can overcome you; but if He should forsake you, who is there that can aid you after Him? And upon Allah let the believers rely.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Among the Qualities of Our Prophet Muhammad are Mercy and Kindness
Allah addresses His Messenger and reminds him and the believers of the favor that He has made his heart and words soft for his Ummah, those who follow his command and refrain from what he prohibits.
فَبِمَا رَحْمَةٍ مِّنَ اللَّهِ لِنتَ لَهُمْ
(And by the mercy of Allah, you dealt with them gently) 3:159. meaning, who would have made you this kind, if it was not Allah's mercy for you and them. Qatadah said that,
فَبِمَا رَحْمَةٍ مِّنَ اللَّهِ لِنتَ لَهُمْ
(And by the mercy of Allah, you dealt with them gently) means, "With Allah's mercy you became this kind." Al-Hasan Al-Basri said that this, indeed, is the description of the behavior that Allah sent Muhammad with. This Ayah is similar to Allah's statement,